I did a quick search for you on Google ("Dawn of Discovery tutorial"). There are several videos available on YouTube. I did not check them out individually but knock yourself out and have fun!
Here is the link to a result page listing a few of them (try it without copy/paste!):

Additionally, the tutorial is basically playing the campaign. It starts pretty simply and holds you by the hand, slowly introducing new concepts. You might have already figured that out by now, but hope you enjoy the game.